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Debt (Details) € in Millions, $ in Millions	3 Months Ended	9 Months Ended
Debt (Details) € in Millions, $ in Millions	Jun. 26, 2020 USD ($)	Jun. 26, 2020 USD ($)	Jun. 28, 2019 USD ($)	Jun. 26, 2020 EUR (€)	Sep. 27, 2019 USD ($)
Debt
Ownership percentage in TEGSA	100.00%	100.00%		100.00%
Repayments of debt		$ 352	$ 441
Fair value of debt	$ 4,484	4,484			$ 4,278
Long-term debt	3,395	3,395			3,395
Short-term debt	$ 691	$ 691			570
0.00% euro-denominated senior notes due 2025
Debt
Debt Instrument, Face Amount \| €				€ 550
Debt instrument, interest rate (as a percent)	0.00%	0.00%		0.00%
Commercial paper
Debt
Commercial paper	$ 0	$ 0			$ 219
Weighted-average interest rate (as a percent)					2.20%
Floating rate senior notes due 2020
Debt
Repayments of debt	$ 350
Reclassification \| 4.875% senior notes due 2021
Debt
Debt instrument, interest rate (as a percent)	4.875%	4.875%		4.875%
Long-term debt	$ (250)	$ (250)
Short-term debt	$ 250	$ 250
Reclassification \| Euro-denominated fixed-to-floating rate senior notes due 2021
Debt
Long-term debt \| €				€ (350)
Short-term debt \| €				€ 350